Introgression is an important biological process affecting at least 10% of the extant species in the animal kingdom. Introgression significantly impacts inference of phylogenetic species relationships where a strictly binary tree model cannot adequately explain reticulate net-like species relationships. Here, we use phylogenomic approaches to understand patterns of introgression along the evolutionary history of a unique, nonmodel insect system: dragonflies and damselflies (Odonata). We demonstrate that introgression is a pervasive evolutionary force across various taxonomic levels within Odonata. In particular, we show that the morphologically “intermediate” species of Anisozygoptera (one of the three primary suborders within Odonata besides Zygoptera and Anisoptera), which retain phenotypic characteristics of the other two suborders, experienced high levels of introgression likely coming from zygopteran genomes. Additionally, we find evidence for multiple cases of deep inter-superfamilial ancestral introgression. [Gene flow; Odonata; phylogenomics; reticulate evolution.]

中文翻译：

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祖先的深层渗入塑造了蜻蜓和豆娘的进化史

基因渗入是一个重要的生物学过程，影响了动物界至少 10% 的现存物种。基因渗入显着影响系统发育物种关系的推断，其中严格的二叉树模型无法充分解释网状网状物种关系。在这里，我们使用系统基因组学方法来了解沿一个独特的、非模式昆虫系统的进化史的渐渗模式：蜻蜓和豆娘（蜻蜓目）。我们证明基因渗入是一种普遍的进化力量，跨越了 Odonata 的各个分类水平。特别是，我们展示了形态学上“中间”的异合翅目物种（除了合翅目和异翅目之外，蜻蜓目中的三个主要亚目之一），它们保留了其他两个亚目的表型特征，经历了可能来自接合翅目基因组的高水平基因渗入。此外，我们发现了多起深层超家族间祖先渗入的证据。【基因流；蜻蜓目; 系统基因组学；网状进化。]